一种非理想反馈MIMO-OFDM系统资源分配算法

摘要

针对多用户MIMO-OFDM系统资源分配问题,给出了一种基于非理想反馈的自适应子载波分配算法.由于实际系统中往往存在反馈时延和反馈误差,利用置信系数和等价方差模型来表征反馈信道状态信息的质量,以最大化系统和容量为目标,在发射总功率一定并满足误码率约束条件下,将子载波分配给信道增益最好的用户,然后对所有子载波进行注水功率分配.理论分析和仿真结果表明,该算法能够充分利用多用户的分集增益,有效地提高了系统和容量性能.%This paper proposed an adaptive subcarrier allocation algorithm for multiuser MIMO-OFDM systems with imperfect feedback. Because of feedback delay and feedback error in actual environment, this algorithm used the confidence coefficient and equivalent variance to indicate the feedback CSI quality. The proposed algorithm aimed at maximizing system throughput and under the constraint of transmit power and BER, assigned the subcarrier to the best user step by step, and then implemented water-filling power allocation. The theoretical analysis and simulation results show that the algorithm can take full advantage of multiuser diversity, and improve the system capacity effectively.